diff --git a/src/Xamarin.Android.Build.Debugging.Tasks/Tasks/WaitForAppDetection.cs b/src/Xamarin.Android.Build.Debugging.Tasks/Tasks/WaitForAppDetection.cs
index b4a4f11629a..13c878806fd 100644
--- a/src/Xamarin.Android.Build.Debugging.Tasks/Tasks/WaitForAppDetection.cs
+++ b/src/Xamarin.Android.Build.Debugging.Tasks/Tasks/WaitForAppDetection.cs
@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -13,7 +14,7 @@ public class WaitForAppDetection : AsyncTask
 	{
 		public override string TaskPrefix => "WFAD";
 
-		System.Threading.Tasks.Task<List<AndroidInstalledPackage>> getPackagesAsync;
+		System.Threading.Tasks.Task<List<AndroidInstalledPackage>>? getPackagesAsync;
 
 		public override bool Execute ()
 		{